C语言UDP传输系统源码 - 快网idc优惠网

本文实例为大家分享了C语言 UDP 传输系统的具体代码，供大家参考，具体内容如下

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/*加载库文件*/

#pragma comment( lib, "ws2_32.lib" )

/*加载头文件*/

#include <winsock2.h>

#include <ws2tcpip.h>

#include <stdio.h>

#include <stdlib.h>

/*定义多播常量*/

#define MCASTADDR "224.3.5.8"

#define MCASTPORT 25000

#define BUFSIZE 1024

#define MCOUNT 10

/*定义广播常量*/

#define BCASTPORT 5050

#define BCOUNT 10

/*定义广播全局变量*/

SOCKET socketBro;

SOCKET socketRec;

struct sockaddr_in addrBro;

struct sockaddr_in addrRec;

BOOL broadSendFlag;

BOOL broadFlag;

DWORD bCount;

DWORD bcastAddr;

short bPort;

/*定义多播全局变量*/

SOCKET socketMul;

SOCKET sockJoin;

struct sockaddr_in addrLocal;

struct sockaddr_in addrMul;

BOOL multiSendFlag;

BOOL bLoopBack;

BOOL multiFlag;

DWORD dwInterface;

DWORD dwMulticastGroup;

DWORD mCount;

short mPort;

/*自定义函数*/

void initial();

void GetArgments(int argc, char **argv);

void userHelpAll();

void userHelpBro();

void userHelpMul();

void broadcastSend();

void broadcastRec();

void mulControl();

void multicastSend();

void multicastRec();

/*初始化全局变量函数*/

void initial()

{

/*初始化广播全局变量*/

bPort = BCASTPORT;

bCount = BCOUNT;

bcastAddr = INADDR_BROADCAST;

broadSendFlag = FALSE;

broadFlag = FALSE;

multiFlag = FALSE;

/*初始化多播全局变量*/

dwInterface = INADDR_ANY;

dwMulticastGroup = inet_addr(MCASTADDR);

mPort = MCASTPORT;

mCount = MCOUNT;

multiSendFlag = FALSE;

bLoopBack = FALSE;

}

/*参数获取函数*/

void GetArgments(int argc, char **argv)

{

int i;

/*如果参数个数小于2个*/

if(argc<=1)

{

userHelpAll();

return ;

}

/*获取广播选项*/

if(argv[1][0]=='-'&&argv[1][1]=='b')

{

/*广播标志设置为真*/

broadFlag = TRUE;

for(i=2; i < argc ;i++)

{

if (argv[i][0] == '-')

{

switch (tolower(argv[i][1]))

{

/*如果是发送者*/

case 's':

broadSendFlag = TRUE;

break;

/*广播的地址*/

case 'h':

if (strlen(argv[i]) > 3)

bcastAddr = inet_addr(&argv[i][3]);

break;

/*广播的端口号*/

case 'p':

if (strlen(argv[i]) > 3)

bPort = atoi(&argv[i][3]);

break;

/*广播(接收或者发送)的数量*/

case 'n':

bCount = atoi(&argv[i][3]);

break;

/*其他情况显示用户帮助，终止程序*/

default:

{

userHelpBro();

ExitProcess(-1);

}

break;

}

return ;

}

/*获取多播选项*/

if(argv[1][0]=='-'&&argv[1][1]=='m')

{

/*多播标志设置为真*/

multiFlag = TRUE;

for(i=2; i < argc ;i++)

{

if (argv[i][0] == '-')

{

switch (tolower(argv[i][1]))

{

/*如果是发送者*/

case 's':

multiSendFlag = TRUE;

break;

/*多播地址*/

case 'h':

if (strlen(argv[i]) > 3)

dwMulticastGroup = inet_addr(&argv[i][3]);

break;

/*本地接口地址*/

case 'i':

if (strlen(argv[i]) > 3)

dwInterface = inet_addr(&argv[i][3]);

break;

/*多播端口号*/

case 'p':

if (strlen(argv[i]) > 3)

mPort = atoi(&argv[i][3]);

break;

/*环回标志设置为真*/

case 'l':

bLoopBack = TRUE;

break;

/*发送(接收)的数量*/

case 'n':

mCount = atoi(&argv[i][3]);

break;

/*其他情况，显示用户帮助，终止程序*/

default:

userHelpMul();

break;

}

return;

}

/*全局用户帮助函数*/

void userHelpAll()

{

printf("Please choose broadcast[-b] or multicast[-m] !\\n");

printf("userHelpAll: -b [-s][p][-h][-n] | -m[-s][-h][-p][-i][-l][-n]\\n");

userHelpBro();

userHelpMul();

}

/*广播用户帮助函数*/

void userHelpBro()

{

printf("Broadcast: -b -s:str -p:int -h:str -n:int\\n");

printf(" -b Start the broadcast program.\\n");

printf(" -s Act as server (send data); otherwise\\n");

printf(" receive data. Default is receiver.\\n");

printf(" -p:int Port number to use\\n ");

printf(" The default port is 5050.\\n");

printf(" -h:str The decimal broadcast IP address.\\n");

printf(" -n:int The Number of messages to send/receive.\\n");

printf(" The default number is 10.\\n");

}

/*多播用户帮助函数*/

void userHelpMul()

{

printf("Multicast: -m -s -h:str -p:int -i:str -l -n:int\\n");

printf(" -m Start the multicast program.\\n");

printf(" -s Act as server (send data); otherwise\\n");

printf(" receive data. Default is receiver.\\n");

printf(" -h:str The decimal multicast IP address to join\\n");

printf(" The default group is: %s\\n", MCASTADDR);

printf(" -p:int Port number to use\\n");

printf(" The default port is: %d\\n", MCASTPORT);

printf(" -i:str Local interface to bind to; by default \\n");

printf(" use INADDRY_ANY\\n");

printf(" -l Disable loopback\\n");

printf(" -n:int Number of messages to send/receive\\n");

ExitProcess(-1);

}

/*广播消息发送函数*/

void broadcastSend()

{

/*设置广播的消息*/

char *smsg="The message received is from sender!";

BOOL opt=TRUE;

int nlen=sizeof(addrBro);

int ret;

DWORD i=0;

/*创建UDP套接字*/

socketBro=WSASocket(AF_INET,SOCK_DGRAM,0,NULL,0,WSA_FLAG_OVERLAPPED);

/*如果创建失败*/

if(socketBro==INVALID_SOCKET)

{

printf("Create socket failed:%d\\n",WSAGetLastError());

WSACleanup();

return;

}

/*设置广播地址各个选项*/

addrBro.sin_family=AF_INET;

addrBro.sin_addr.s_addr=bcastAddr;

addrBro.sin_port=htons(bPort);

/*设置该套接字为广播类型*/

if (setsockopt(socketBro,SOL_SOCKET,SO_BROADCAST,(char FAR *)&opt,

sizeof(opt))==SOCKET_ERROR)

/*如果设置失败*/

{

printf("setsockopt failed:%d",WSAGetLastError());

closesocket(socketBro);

WSACleanup();

return;

}

/*循环发送消息*/

while(i<bCount)

{

/*延迟1秒*/

Sleep(1000);

/*从广播地址发送消息*/

ret=sendto(socketBro,smsg,256,0,(struct sockaddr*)&addrBro,nlen);

/*如果发送失败*/

if(ret==SOCKET_ERROR)

printf("Send failed:%d",WSAGetLastError());

/*如果发送成功*/

else

{

printf("Send message %d!\\n",i);

}

i++;

}

/*发送完毕后关闭套接字、释放占用资源*/

closesocket(socketBro);

WSACleanup();

}

/*广播消息接收函数*/

void broadcastRec()

{

BOOL optval = TRUE;

int addrBroLen;

char buf[256];

DWORD i=0;

/*该地址用来绑定套接字*/

addrRec.sin_family=AF_INET;

addrRec.sin_addr.s_addr=0;

addrRec.sin_port=htons(bPort);

/*该地址用来接收网路上广播的消息*/

addrBro.sin_family=AF_INET;

addrBro.sin_addr.s_addr=bcastAddr;

addrBro.sin_port=htons(bPort);

addrBroLen=sizeof(addrBro);

//创建UDP套接字

socketRec=socket(AF_INET,SOCK_DGRAM,0);

/*如果创建失败*/

if(socketRec==INVALID_SOCKET)

{

printf("Create socket error:%d",WSAGetLastError());

WSACleanup();

return;

}

/*设置该套接字为可重用类型*/

if(setsockopt(socketRec,SOL_SOCKET,SO_REUSEADDR,(char FAR *)&optval,

sizeof(optval))==SOCKET_ERROR)

/*如果设置失败*/

{

printf("setsockopt failed:%d",WSAGetLastError());

closesocket(socketRec);

WSACleanup();

return;

}

/*绑定套接字和地址*/

if(bind(socketRec,(struct sockaddr *)&addrRec,

sizeof(struct sockaddr_in))==SOCKET_ERROR)

/*如果绑定失败*/

{

printf("bind failed with: %d\\n", WSAGetLastError());

closesocket(socketRec);

WSACleanup();

return ;

}

/*从广播地址接收消息*/

while(i<bCount)

{

recvfrom(socketRec,buf,256,0,(struct sockaddr FAR *)&addrBro,(int FAR *)&addrBroLen);

/*延迟2秒钟*/

Sleep(2000);

/*输出接收到缓冲区的消息*/

printf("%s\\n",buf);

/*情况缓冲区*/

ZeroMemory(buf,256);

i++;

}

/*接收完毕后关闭套接字、释放占用资源*/

closesocket(socketRec);

WSACleanup();

}

/*多播控制函数*/

void mulControl()

{

int optval;

/*创建UDP套接字，用于多播*/

if ((socketMul = WSASocket(AF_INET, SOCK_DGRAM, 0, NULL, 0,

WSA_FLAG_MULTIPOINT_C_LEAF

| WSA_FLAG_MULTIPOINT_D_LEAF

| WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)

{

printf("socket failed with: %d\\n", WSAGetLastError());

WSACleanup();

return ;

}

/*设置本地接口地址*/

addrLocal.sin_family = AF_INET;

addrLocal.sin_port = htons(mPort);

addrLocal.sin_addr.s_addr = dwInterface;

/*将UDP套接字绑定到本地地址上*/

if (bind(socketMul, (struct sockaddr *)&addrLocal,

sizeof(addrLocal)) == SOCKET_ERROR)

/*如果绑定失败*/

{

printf("bind failed with: %d\\n", WSAGetLastError());

closesocket(socketMul);

WSACleanup();

return ;

}

/*设置多播地址各个选项*/

addrMul.sin_family = AF_INET;

addrMul.sin_port = htons(mPort);

addrMul.sin_addr.s_addr = dwMulticastGroup;

/*重新设置TTL值*/

optval = 8;

/*设置多播数据的TTL(存在时间)值。默认情况下，TTL值是1*/

if (setsockopt(socketMul, IPPROTO_IP, IP_MULTICAST_TTL,

(char *)&optval, sizeof(int)) == SOCKET_ERROR)

/*如果设置失败*/

{

printf("setsockopt(IP_MULTICAST_TTL) failed: %d\\n",WSAGetLastError());

closesocket(socketMul);

WSACleanup();

return ;

}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。

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